Chapter 14, Problem 110A

Interpretation Introduction

Interpretation: From the given elements, metals need to be identified.

Concept Introduction: An element in the periodic table can be classified as a metal, non-metal, metalloid, or noble gas depending on its position in the periodic table. The left part of the periodic table contains all metals, the right part contains all non-metals and the middle part contains metalloids.

Explanation of Solution

Reason for correct option/s:

Consider option (b), tungsten belongs to group 6 in the periodic table. The atomic number of tungsten is 74. It is classified as a transition metal in the periodic table (d-block). Therefore, it is a metal.

Therefore, option (b) is correct.

Conclusion

Reason for incorrect option/s:

Consider option (a), arsenic belongs to group 15 or the nitrogen family in the periodic table. The atomic number of arsenic is 33. Since it belongs to group 15, thus, the number of electrons in the outermost shell is 5. It can gain 3 electrons to complete its octet. The elements that gain electron/s are non-metals; thus, arsenic is a non-metal, not a metal.

Therefore, option (a) is incorrect.

Consider option (c), xenon belongs to group 18 or the noble gas family in the periodic table. The atomic number of xenon is 54. It has 8 electrons in the outermost shell thus, it already has a complete octet. It can neither gain nor lose electron/s for stability. Since it is a noble gas, it is not a metal.

Therefore, option (c) is incorrect.